JPH02262808A - Collective substation - Google Patents

Abstract

PURPOSE:To reduce installation area and to shorten installation schedule by securing an extra-high-tension power receiving switchgear and a high voltage distribution switchgear with the side faces requiring no maintenance abutting on each other and arranging high voltage bushing and extra-high-tension bushing of transformer in the same direction. CONSTITUTION:Electrical connecting is carried out such that the primary bushing 32a of a cubicle type gas insulated switchgear 10 is connected through a slip-on type cable 33 with the primary bushing 32b of a transformer 2 on the primary side, while one end of a cable 36 is secured through bolts to the central conductor 35 of the secondary bushing 34 of the transformer 2 and the other end of the cable 36 is passed below the primary DC board 15 and a power receiving VCB board 13 then secured through bolts to the cable joint 37 of 6.6kV secondary power receiving board 25. Furthermore, mechanical joints are covered with ducts 37a, 37b made of thin steel plate and rubber boots 38a, 38b are fixed in order to prevent transmission of vibration of transformer.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to collective layer substation equipment comprising an extra high voltage switchgear, a transformer that steps down the voltage from the extra high voltage to a higher voltage, and a high voltage switchgear. be.

(Prior Art) Hereinafter, the conventional technology will be explained using 66/77 KV class extra-high-voltage substation equipment as an example. 66KV class power receiving equipment includes: ■Open type power receiving equipment, ■Housing type power receiving equipment, and ■Gas insulated power receiving equipment (GIS; G
as In5uiated Switchgear)@
) Cubicle type gas insulated switchgear (C-GIS;
Cubicle type GIS).

By the way, the above-mentioned open power receiving equipment is a circuit breaker.

Electrical equipment such as disconnectors, grounding disconnectors, voltage transformers, current transformers, and lightning arresters were connected using stranded copper wire and aluminum pipes, and the power receiving equipment utilized air insulation.

For this reason, the installation space becomes large because each electrical device is arranged in series, and the air-insulated system exposes the live parts, which poses a safety problem.

In contrast, as construction costs and land prices soared, live parts became contaminated and
safety,! Due to problems such as noise, there was a demand for smaller and more airtight power receiving equipment, and the gas insulated power receiving equipment (GIS) was developed. This is a compact and airtight device in which each of the electrical devices described above is covered with a pipe-shaped metal container, and high-pressure SF and gas are filled in as an insulating medium.

In addition, the cubicle-type gas-insulated power receiving equipment described above has higher reliability, safety, and simpler maintenance and inspection than the gas-insulated power receiving equipment described above, can be constructed in a short period of time on a narrow site, and is This power receiving equipment was developed to meet the demands for harmonization with the surrounding environment. This is a cubicle-shaped container that uses low-pressure insulating gas near atmospheric pressure to house all electrical equipment, and the interior is divided into constituent units.It has an appearance similar to other closed switchboards. be.

In this way, 66KV class power receiving equipment is ω non-container type, (
2) The appearance has been changed to a pipe-like container shape and a cubicle container shape.

(Problem to be solved by the invention) Substation equipment can be broadly classified into special high voltage power receiving switchgear.

It consists of a transformer and high-voltage distribution switchgear, and can function by electrically connecting them in series. However, each device
Its appearance has changed dramatically with the progress of technological development.

In particular, the 66KV extra high voltage power receiving switchgear has been changing from a non-container type to a pipe-like container type and a cubicle type as described above. However, when configuring the power receiving equipment as a system, three devices were simply connected electrically.

FIG. 5 shows an example of 66/6 in the current state of the art.
A perspective view of 6KV power receiving equipment is shown. This power receiving equipment is 66
KV cubicle type gas insulated switchgear 1. Transformer 2,
It consisted of a 6.6KV high voltage distribution switchgear 3, and was arranged in a distributed manner with electrical connections.

FIG. 6 shows a plan view of FIG. 5. The 66KV cubicle type gas insulated switchgear 1 and the 6.6KV high voltage distribution switchgear 3 were so-called front and rear maintenance type cubicles with doors provided on the front and rear sides. For this reason, in order to maintain and inspect each piece of equipment, a maintenance and inspection space 4 shown in the figure is required, which necessitates a distributed arrangement. This is,
This has been a drawback that limits the ability to reduce the installation area of power receiving equipment.

Furthermore, due to the distributed arrangement, each device is electrically connected, which requires cable connection work and cable pit construction to store the cables, which has the drawback of requiring extra construction time and construction costs.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a collective layer substation facility that can reduce the installation area and shorten the on-site construction period.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides front and side maintenance type extra high voltage power receiving switchgear, and front maintenance type high voltage The non-maintenance sides of the power distribution switchgear are brought into contact and fixed, and the special high-voltage side bushing and high-voltage side bushing of the transformer are placed in the same direction, and connected to each main circuit of the special high-voltage power receiving switchgear and the high-voltage distribution switchgear. That's what Shidamo does.

(Function) Special high-voltage power receiving switchgear and high-voltage distribution switchgear can be assembled, and these can also be assembled with transformers, reducing maintenance and inspection space, reducing the area of substation equipment, and connecting cables via cable pits. It is possible to shorten the installation period by eliminating the need for cable connection work.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. Note that this embodiment is intended for 66/6.6 KV power receiving equipment.

FIG. 1 is a single-line connection diagram of an embodiment of the present invention, and is a common standby 2CB power receiving-2 described in Electric Kyodo Research Vol. 29, No. 4.
An example of standard connection of special high-voltage power receiving equipment for puncture-next DS is shown, FIG. 2 is a perspective view of one embodiment of the present invention, and FIG. 3 is a partially cutaway view of one embodiment of the present invention. A plan view is shown.

In FIGS. 1, 2, and 3, the collective power receiving equipment includes a cubicle gas insulated switchgear (C-GIS) 10 as a 66KV power receiving switchgear, a transformer 2, and 6.
It is composed of a 6KV high voltage distribution switchgear 11.

The cubicle-type gas insulated switchgear 10 has two sides with power receiving VCB boards 13 placed apart from each other, and
One side of each power receiving VCB board 13 (the upper side in Figure 3) The primary DS board 15, which is arranged so as to protrude from the top, is composed of two sides. In addition, each board is filled with SFs gas, making it a transport unit. At the installation site, bolts are tightened at the aerial part of each panel and the panels are fixed side by side. Each panel accommodates electrical equipment shown in the single-line connection diagram of FIG. 1, respectively.

The power receiving VCB board 13 is provided with a door 13a, and has a circuit breaker 16. Disconnector 17. The earthing/disconnecting switch 18 can be maintained, inspected, and operated (a similar example is shown in Fig. 6 of Japanese Patent Application Laid-open No. 160309/1983). In addition, a side plate 13 is provided on one side of the power receiving VCB board 13, excluding the contact surface with the primary DS board 15.
b, and a working door 13c for connecting a 66KV cable 19 drawn in from an electric power company to the cable pend 20 is provided on this side surface 15b.

The PCT board 1 has a part protruding from one side surface of the upper 4 power receiving VCB board 13, and a flange 14a is provided on this part to be connected to the PCT 12.

The primary DS board 15 is equipped with a door 15a and a disconnector 21. The earthing/disconnecting switch 22 can be maintained, inspected, and operated. In addition, the door 15a and the power receiving VCB panel 1
A side plate 15b is provided on the side surface excluding the surface in contact with 3.

The method of arranging these panels is to place the non-maintenance surface 13d of the power receiving VCB 1113 and the maintenance surface 14b of the PCT panel 1 top 4 in close contact with each other back to back, and connect them with bolts (not shown). Power receiving VC
The non-maintenance surface 13a of the B board 13 and the non-maintenance surface 15c of the primary DS board 15 are brought into close contact back to back and connected with bolts (not shown). In this case, the surfaces of the door 13a and the door 15a are made to be the same. This completes the mechanical connection of the 66KV power receiving switchgear, but in this state, when viewed from above, it has a shape similar to that of a "RE" laid down on its side, making it a side-maintenance device.

Next, a method for electrically connecting the main circuit will be explained. A T-shaped bushing known from Japanese Patent Laid-Open No. 60-160309 is attached to the ceiling of each panel, and is electrically connected with a cable. That is, T-shaped bushings 23a for three phases are attached to the power receiving VCB panel 13, and T-shaped bushings 23b for 43 phases are attached to the PCT panel 1, and both T-shaped bushings 23a.

23b with a cable 24a. This allows the PC
The connection on the primary side of T12 is completed. In addition, T-shaped bushings 23c for 42 phases are installed on the PCT panel 1, and T-shaped bushings 23d for 3 phases are installed on the primary DS panel 15, and both bushings 23c and 23d are connected to the cable 24b. Connect with. As a result, two phases of current elements of the PCT 12 are connected. Here, since the voltage element of the PCT 12 only needs to be electrically connected, the power receiving VCB
T-shaped bushing 23 located in the middle phase of g113
It is connected to the primary DS board 15 via cable 24c from the opposite side of a. This completes the connection of the secondary side of the PCT 12.

With the above, the electrical and mechanical connection work for the 66KV gas insulated switchgear has been completed.

In addition, the 6.6KV power distribution switchgear 11 has two main guest secondary power receiving boards 25, one busbar communication board 26, one in-house transformer board 27, and four distribution board 28. It is configured. Note that the distribution board 28 has a structure in which circuit breakers 29 can be stacked in three stages. In addition, each board has a known configuration,
It has a front maintenance type structure with a door 30 on the front so that internal inspection and maintenance, circuit breaker operation, etc. can be performed, and the back side is a non-maintenance side. Further, these panels are arranged in a row and mechanically connected with bolts (not shown), and electrically connected with a busbar (not shown) provided on the ceiling inside the panel.

With the above, the electrical and mechanical connection work of the 6.6KV distribution switchgear 11 has been completed.

Next, 66KV gas insulated switchgear! 10 and 6.6KV distribution switchgear! ! 11 connections will be explained. Front surface (lower surface in FIG. 3) 31a of cubicle type gas insulated switchgear 10 configured in rows and 6.6KV distribution switchgear 1
The back surface 31b of No. 1 is a non-maintenance surface. These maintenance surfaces 31a and 31b are brought into contact with each other back to back and connected with bolts (not shown).

As described above, the cubicle type gas insulated switchgear lO゛ and the 6KV distribution switchgear 11 are mechanically connected,
It will be collected.

Next, the connection between the cubicle type gas insulated switchgear 10.6, 6KV power distribution switchgear 11 and the transformer 2, which are assembled in one or more ways, will be explained. FIG. 4 shows a sectional view taken along the line A--A in FIG. 3.

First, the electrical connection is made on the primary side with the modified primary bushing 32 of the cubicle type gas insulated switchgear 10 as shown in the figure.
A and the raw modified primary bushing 32b of the transformer 2 are connected with a slip-on cable 33, and the secondary side is connected to the ladder plate-shaped center conductor 35 of the raw modified secondary bushing 34 of the transformer 2, and the cable 36 One end is fixed with a bolt, and the other end is the main guest's primary D.
Sg115, passing through the bottom of power receiving VCB ff113, 6
．． It is fixed to the cable connection part 37 of the 6KV main change secondary power receiving board 25 with bolts.

Further, the mechanical connection portion is a duct 37a made of a thin steel plate.

37b, and rubber boots 38a, 38b are attached to prevent transmission of transformer vibrations.

Based on the above, cubicle type gas insulated switchgear 10.6
．． Electrical connection between 6KV distribution switchgear 11 and transformer 2
Mechanical connections have been completed and 66/6.6KV substation equipment has been integrated.

Note that although the above explanation has mainly focused on the extra high voltage/high voltage main circuit, the control cable can also be connected within the cubicle.

〔Effect of the invention〕

As explained above, according to the present invention, the special high-voltage power receiving switchgear, transformer, and high-voltage distribution switchgear are grouped together, so the maintenance and inspection space is also grouped, and the installation area of the substation equipment is significantly reduced. Ru.

At the same time, conventionally, pits were dug and cables such as the primary and secondary connections and control cables were buried, but by grouping them together, they can be placed inside the cubicle, eliminating the need for pits. For this reason, construction costs for the substation facility site,
The construction period can also be significantly reduced.

In addition, the gas-insulated switchgear, which is a special high-voltage power receiving switchgear, is filled with insulating gas at the factory, eliminating the need for on-site gas treatment. High-voltage distribution switchgears can be transported even when two or three sides are stacked side by side.

In this way, it is possible to reduce the work required to connect the high-voltage side bus bar and control line after installation on-site, and it is possible to significantly reduce the number of workers and time required for the entire post-installation work.

[Brief explanation of drawings]

Fig. 1 is a single line connection diagram showing an embodiment of the present invention, Fig. 2 is a perspective view showing an embodiment of the invention, and Fig. 3 is a partially cutaway plan view showing an embodiment of the invention. , Figure 4 is A- in Figure 3.
A cross-sectional view taken along line A, FIG. 5 is a perspective view of a conventional substation facility, and FIG. 6 is a plan view of the conventional substation facility. 2...Transformer 10...Cubicle type gas insulated switchgear 11...
6.6KV high voltage distribution switchgear 12-P CT
13-...Power receiving VCB board 14...PCT board
15...Seihen 1st DS board (8733) Agent: Patent attorney Yoshiaki Inomata (and 1 other person) Figure 2

Claims (1)

[Claims] In the substation equipment consisting of an extra high voltage power receiving switchgear, a transformer, and a high voltage distribution switchgear, the non-maintenance side of the side maintenance type special high voltage power receiving switchgear and the maintenance type high voltage distribution switchgear are brought into contact with each other. Further, the special high voltage side bushing and the high voltage side bushing of the transformer are provided in the same direction, and are connected to each main circuit of the special high voltage power receiving switchgear and the high voltage distribution switchgear. Collective substation equipment.